Kendrick Lamar might be the most electric live rapper currently working, and he got a chance to display that on last night's episode of Late Night With Jimmy Fallon. Kendrick teamed up with the Roots on "Swimming Pools (Drank)," the whirling drunken lament from his forthcoming LP good kid, m.A.A.d. city. ?uestlove, while drumming, helped out with the screwed-up backing ...